Centrifugal pump.



' N 885,108. PATENTED'APR. 21, 1908.

' S.V.TRENT.

GENTRIFUGAL PUMP.

APPLICATION FILED JAN. 21, 1907.

2 sumsmm 1.

vwautoz Witnesses Witness PATENTED APR. 21; 1908. S. V. TRENT.

OENTRIFUGAL PUMP. 8

APPLICATION nun JAN. 21, 1901.

2 SHEETS-SHEET 2.

Ill ll To all whom it may concern: Be it known-that I, SIMEON V. TRENT, a resident of 'Salt Lake City, SaltLake county,

State .of Utah, have'inivented a new and use-1 ful Improvementin Centrifugal Pumps Usedfor Pumping Liquids, ofwhich the following *ji's-a speclfications 1 v I My vention relates to 1mprovements in I pumps of the style or type known as centrifu- 1 greater useful efiect, but also, as ccuse-- gel, the purpose-being to modifythe'usual construction of. this formof pump 'soas to attain a higher degree of 'efiiciencyor economy.- First, by ap lying theforce or power for the propulsion 0 Water through the pump in Such a way as to not only produce, a

quence thereof,to produce a higher pressure with. af given peripheral velocity. Second, to so, devise the passage through which the" water? is forced into the voilute, or; pressure chamber, bytheimpell'er, as o absolutely prevent any back pressure or reaction on the impeller, or any possibility, of the exterior of the lmpeller revolving in contact with theliquid passing through the pump. o

use'txof the side-suction rm of impeller,

' whereby more than one bearing for the, pump shaft is obviated, and; any occasion for a stufiing-box joint through the suction 'as-' s/age becomes unnecessary. .This res t is.

attained ,,With, my side-suction form of impeller by making openings or assages through the maln part of the impel er, near its hub orcenter, to the driving-side or side opposite to the suction; Int-his way the tendency to ,cause a vacuum on the suctionside, that is set up-by the operation of the pum' when in actionyis causedto assert itsel on 0th sides sun that t of the impeller, wherebythe tendency to .e d thrust toward the suctlon side, that is oh racteristic of the ordinary construction of side suction implellers, is eliminated, with the ree impeller revolves almost completely'in-balance.

'IAslregards the first named of the -three above novel features, as far; as .Iwknow, "all existing es of "centrifugal pumps, ,whether using 6 ,,'Withde .orcentralflwater ways,;or nn ellers of the centralweb pattern,

are invaria ly constructed either upon the directradiafl principle; or with arms orpa'rtitions approaching more or less to'the' in,-

' volute curve. The consequence of this-com structionli's to i produce water ways or pas. v g g'qi ross sectlonexpandingor increasing a. toward. theperipheryof the inipellelifiiMy;

eryofthe impeller.

like parts throughout the several figures. Third, by the To t the volute C. The cylinder is so constructed;

shown em Fi .2. 111m ap er power shaft .13, by the nut J, and key-f},

Patented 21, 1908.

construction is diametrically opposed to this, and provides at least for forming Water assages of'uniform' cross section or area, or 'y an extension of the same principle, to 0' make them of constantly contracting cross section or areaas they approach the periph- Seeing that the cross section of any'stream 1 of water is necessarily reduced as its'velocity I increases, and that the velocity of'a stream of water through a pump impeller is necessarily increased as that stream a proaches the periphery of the impeller and in an exact and well determined ratio, it is apparent that the, passing of a streamof'water thro h a passage larger in area or cross section tlian itself must set u atendency to cause a vacuum, "which ten encyrepresents a v wasteful counter-force to be overcome by thepower used in the pumps operation.

I attain these objects by the ,improvements shown in'the accompanying drawings I in which siinilar letters of reference, indicate Flgure 1. is an end elevation of the pump. Fig.2. is a' vertical section, on line w m, of A Fig. 1.- Fig. 3.. is a side elevation 'of the pump, with the discharge elbow. Fig. 4. is

a front elevation of a section ,or part of the impeller, with the Water passages located in a radial sense,- from the suction chamber. Fig. 5. is a-front elevation of a section or part of the impeller, with the water passages 10- cated'in a tangential sense from thesuction chamber Fig. 6. is'a vertical section of the impeller, on-line m w,'of Fig,' 1. "Fig. 7. is-afragmentary view showing more clearl the formation. of the contracted discharge t oat leading from the impeller to the volute.

The cylinder is formed'by the two headsA,

It is bisected. an

on one end,'-that a suction elbow H, may be attached, and on the other end. is provided a"; Stllfilllg-bOX F, that isfitted on the operating,

or power, shaft E. The shaft is rotated and 1o5 the impeller is driven by the motor G. f e periphery of thecylinder 1s securedv .as'to-form a contracted opening, or'throat, as'f is attached to the end of,"-

1 ways, and is provided with passage-ways c,

c, 0, etc. located in a tangential sense, as shown in 5, or in a radial sense, as shown which chamber extends into and partially tractingthroat.

through the im eller B, as shown in. Figs. 2, 4, 5, 6, and lea in from this part of the s'uc tion chamber are t e passage-ways c, c, 0, etc.

'The ump andmotor are securelyset on I the-be I, by bolts.

' Thesuction necessary to draw the liquid into, the suction chamber K tends to draw the impeller horizontally and away from the To counteract this tendency, and to alance the impeller B, balancing chambers :b, b, b,' etc. are provided, and also the shaft E is fitted with an end thrust bearing L, and friction rings h, h. The bearing L is secured 'ong-the shaft E by the set screws '5, i.

The passage-ways c, c,v 0, .,etc., whether formed as shown, as a circle at any cross-section, 'or'as an ellipse s uare or rectangle, are uniform in size from t e suction chamber K to the throat,and at that point theydeliver the fluid through the contracted throat so devised as to prevent backpressureon the impeller, 01' if desired the form may be used (as at c", ,c" in Fig. 5) from the suction. chamber :K,-to and corresponding with the coni traction of the throat'at so'that the total area of discharge, of. all the passa e ways isef the outlet 0 :thelcon-J equal to. the area More fully describingthe fun tion and ad- "vantages, of the discharge throat f j; and

' the impeller Itheform' of impeller construction ncorpcflanges overla ping the eripheral'i ortion of it may estated t at under rated in'th'e present invention, theimpeller is i made to discharge a series of jround streams or-jets of water somewhatin'the form of. a star.. The round form is. given to these jets at the point where they le ave the impeller on account of the lesser resistance of a round assage and the further .advanta e of greater acility and ease'inmaking'suc '-'a passa e absolutel smooth and true. The e stream t us delivered by the impeller and the width of which is, of course, equal to. the diameter of the round jets, is, .by means of my contracting throat, narrowed :down-toa i thin continuous stream or circular sheet of water, sufficiently so in fact, to make this thin stream a continuous and unbroken one, whereby the pressure or reactive effect of the water pressure set up in the volute is kept passing through A, v so built, that a suc-.

1,: Motion having 'lpellerz-Bg-by the power driven shaft E, the of a gradual contraction of the passage Ways *and by centrifugal force thrown out of the awag from the periphery of the im eller. Evi ently, so long as the impeller is a le to force water intothe volute it can only be done byreason of the pressure at the periphery of the impeller overcoming water pressure-in the volute.

The pressure thus acting in a radial sense, is acting upon the impeller. T is is an all important feature as in those cases where the impeller periphery is caused to revolve against the'delivery pressure or against the pressure in the volute, a wasteful resistance to the action of the impeller is set up with a corresponding waste of power. My construction is particularly directed to preventing any such resistance or reactive efect u on the impeller, and this is accomplished by the use of the contracting throat which is shown as provided in the impeller casin or cylinder, and which is utilized to so thin down the stream of water delivered from the impeller, that all opportunity for the pressure in the volute to assert itself on the lrnpeller is entirely prevented. The contracting throat has the further effect of entraining from the pump cylinder all air or idle water that may accumulate therein, thereby relieving the impeller from the fric- 'tion even of the ordinary atmospheric pressure, in other words, causing the impeller to rotate inan' almost erfect vacuum, and at ,thesame time avoiding the reactive effect of the water set up b the pump.

een imparted to the imquidlis-dra wn into the suction chamber K,

passages c, c,r'c', etc; through the contracted throat f, f, 1nto the volute or ressure chamber C, and discharged at out et 9, as shown by arrow M.

From the foregoing it will be understood 'that' the casing 0r cylinder heads A, A, have outwardly extending flanges A receiving therebetween, and secured to, the volute C. Also, said heads A, A, are formed with inwardly extending flanges A, the edges of which .are spaced to provide thecontracted throat said flanges A enga ing the outer peri hery of the impeller 13. The inner end oft ethroat f is equal in width to the diameter of thebuter ends of the discharge passages of the impeller, said throat contracting toward its outer end, and the advantages for which construction have been pointed out.-

Having thus described my invention I claim and desire to secure by Letters Patent:

revented from of width at its inner end equal to that of the outer ends of the discharge passages and thence contracting toward its outer end so as to be less in width than thefouter ends of the said gassages.

n a centrifugal pump; the colnbination p of a casing comprlsm heads, one head hay,-

. "having at the outer portions outwardly exing a central suction c amber and both heads tending flanges, avolute secured to said flanges, an impeller; having a suction recess in one side and located between the heads of the gcylind'er and made in sectionsfhaving conof discharge passages leading from the suc-- tacting sides in which are formed a plurality the heads of the casing also having inwardly extendin flanges between the periphery of theimpefier and the volutechamber and said flanges beingspaced apart to provide an an- 29 nular discharge throat, the saldthroat being of a'width at its inner end equal to that of the v outer ends of the dischargepas'sages afore- I said and thence contracting to a lesser width toward a, point of communication thereof 5 with the interior of thevolute as described.

' SIMEON V. TRENT. r r

Witnesses;

' R. D. HUMPHREY,

'Tnos. MURDOCH.

tion recess to the periphery of the impeller, I 

